* wip loading custom css
* read css file from profile directory and apply
* update css handler, add CLI flag to disable custom CSS, documentation
* import ExtensionAppJinjaMixin
* remove ExtensionAppJinjaMixin as a JupyterNotebookApp base class
* add type hint to ignore jinja2_env type
* fix prettier issue in docs
* add empty line; trigger new docs build
* new line caused prettier error, remove
* move custom css to different directory and update handler
* modify regex
* satisfy mypy: check for match in regex before grabbing the directory path
* load custom css in consoles page
Rosio